From cf5a9defdd186fe5bc2b5cc7977e7b091949236f Mon Sep 17 00:00:00 2001
From: Abdelrazak Younes <younes@lyx.org>
Date: Tue, 1 May 2007 17:33:04 +0000
Subject: [PATCH] Restor 1.4.x behaviour: Don't touch the preamble QTextEdit if
 the preamble text is unchanged.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18154 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/frontends/qt4/QDocument.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/frontends/qt4/QDocument.cpp b/src/frontends/qt4/QDocument.cpp
index 322fc0e6f0..9619957ed9 100644
--- a/src/frontends/qt4/QDocument.cpp
+++ b/src/frontends/qt4/QDocument.cpp
@@ -1022,7 +1022,8 @@ void QDocumentDialog::updateParams(BufferParams const & params)
 
 	// preamble
 	QString preamble = toqstr(params.preamble);
-	preambleModule->preambleTE->document()->setPlainText(preamble);
+	if (preamble != preambleModule->preambleTE->document()->toPlainText())
+		preambleModule->preambleTE->document()->setPlainText(preamble);
 
 	// biblio
 	biblioModule->citeDefaultRB->setChecked(